Lamp lock



M. E. BRADY July 22, 1930.

LAMP LOCK Filed Jan. 14, 1929 :JVENT R I BY 1- WITNESS:

Patented July 22, 1930 UNITED STATES sarsurormcs MARY E. BRADY, or; mama, onto,

Application filed January 14, 1929. Strial No. 332,548.

use by hotel and rooming house proprietors:

not only to prevent theft of the light bulbs, but to prevent their removal for the insertion of other current consuming devices, such as electric irons, curling irons, electric stoves and radio equipment.

It is an object of the invention therefore to provide a device which will not only prevent unauthorized removal of a light globe from a socket, but one which is extremely simple in its construction, which is unlikely to get out of order and which is particularly well adapted to perform the services required of it.

ith these and many other objects in view which will more readily appear as the nature of the invention is better understood, the same consists in the novel construction, combination and arrangement of parts shown in the accompanying drawings, in which Figure 1 is a side view of the improved lock showing the device in actual use.

Figure 2 is a side view of the lock assembly, the lock to which the same is attached being 0 shown in dotted lines.

In both of the above mentioned views, like characters of reference are employed to designate like parts thruout. The ordinary light globeis designated as an entirety at 10. This globe comprises a bulb 11 formed of glass havinga reduced portion 12 which. has securedthereto a threaded ferrule 13 formed of copper or any metallic composition that is a.

conductor 7 of electricity. This ferrule 13 forms a contact and is connected in any suitable manner to one end of the resistance unit,

' (not shown) on the interior of the light globe.

Another contact is providedat 14 on the end of the reduced portion 12 and this contact is connected to the other end of the resistance unit and is adapted to contact with a contact in the socket when the globe is screwed into the same.

The socket is shown at 1 1 This socket has a pair of wires 15 leading thereto and has the usual switch operated by a turn button 15 resembling the shape of the ordinary wing nut. In order to prevent removal of the light globe from its socket the ferrule 13 is provided with a strip of material 16 secured to or formed integral with the same. This strip of materialextends along the reduced portion 12 of the light globe and terminates in a lateral. flange 17 adapted to extend outside of the socket 14 when the light globe is screwed into position. The lateral strip 17 is provided with an aperture therethru and this aperture is adapted to receive a wire loop 18 which is passed around the shank of the turn button 15- The loop 18 has its ends brought together and sealed in the usual manner with an ordinary lead seal 19 which may be pressed firmly about these ends.

It obviously apparent that the lateral iiange 17 may be treated by dipping, brush- 1 .ing or other well'known methods of coating with a suitable non-conductive material such as rubber, porcelain, etc., whereby the hands of the person using the particular light will not be subjected to shock incident to contact with any live parts of the fixture. The latter instance is especially true where the sockets are of the pull chain or key operated types.

It will be seen from the above description that when the light is secured into its socket and the wire passed thru the aperture in the flange 17 and around the shank of the memher and sealed therearound, itis impossible for the globe to be removed without detection, for if the globe is to be removed either the seal must be destroyed or the ferrule must be mutilated. It is obvious then that I have provided a device which is extremely simple in construction, and efficient in its operation.

I do not desire to be limited to the exact arrangement of parts shown inthe accompanying drawings, for example, the invention is not confined for use solelyin connection with light globes as any electrical equipment that is provided with a threaded plug for inser-' pointed out in the accompanying claim, do I desire to be limited.

What is claimed is A lock comprising a lamp socket having the shank of the switch therefor projecting for an appreciable distance therefrom, a bulb having a portion removably secured within said socket, an apertured strip carried by and outwardly projecting from the detachably secured portion of the bulb beyond the socket and aligned terminally thereof with saidshank and a seal passed through theapertured portion of the strip and looped about the shank to prevent theft of the-bulb.

In testimony whereof I afiix my signature.

MARY E. BRADY. 

